io_read_line.rs - mozsearch

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use futures::executor::block_on;

use futures::future::{Future, FutureExt};

use futures::io::{AsyncBufReadExt, Cursor};

use futures::stream::{self, StreamExt, TryStreamExt};

use futures::task::Poll;

use futures_test::io::AsyncReadTestExt;

use futures_test::task::noop_context;

fn run<F: Future + Unpin>(mut f: F) -> F::Output {

    let mut cx = noop_context();

    loop {

        if let Poll::Ready(x) = f.poll_unpin(&mut cx) {

            return x;

#[test]

fn read_line() {

    let mut buf = Cursor::new(b"12");

    let mut v = String::new();

    assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 2);

    assert_eq!(v, "12");

    let mut buf = Cursor::new(b"12\n\n");

    let mut v = String::new();

    assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 3);

    assert_eq!(v, "12\n");

    v.clear();

    assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 1);

    assert_eq!(v, "\n");

    v.clear();

    assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 0);

    assert_eq!(v, "");

#[test]

fn maybe_pending() {

    let mut buf = b"12".interleave_pending();

    let mut v = String::new();

    assert_eq!(run(buf.read_line(&mut v)).unwrap(), 2);

    assert_eq!(v, "12");

    let mut buf =

        stream::iter(vec![&b"12"[..], &b"\n\n"[..]]).map(Ok).into_async_read().interleave_pending();

    let mut v = String::new();

    assert_eq!(run(buf.read_line(&mut v)).unwrap(), 3);

    assert_eq!(v, "12\n");

    v.clear();

    assert_eq!(run(buf.read_line(&mut v)).unwrap(), 1);

    assert_eq!(v, "\n");

    v.clear();

    assert_eq!(run(buf.read_line(&mut v)).unwrap(), 0);

    assert_eq!(v, "");

    v.clear();

    assert_eq!(run(buf.read_line(&mut v)).unwrap(), 0);

    assert_eq!(v, "");